CN114495967A - Method, device, communication system and storage medium for reducing reverberation - Google Patents

Abstract

The present disclosure relates to a method, device, communication system and storage medium for reducing reverberation. The method for reducing reverberation includes: determining first time domain information transmitted by a first communication end and second time domain information transmitted by a second communication end information, wherein the first time domain information is the audio frequency corresponding to the original sound wave, and the second time domain information is the audio frequency corresponding to the reflected sound wave of the original sound wave; according to the first time domain information and the second time domain information, determine the reverberation duration; The reverberation duration controls the state of the high-pass filter unit of the communication system. In this method, according to the audio frequency corresponding to the original sound wave and the audio frequency corresponding to the reflected sound wave of the original sound wave, the reverberation duration of the original wave and the reflected sound wave is determined, and then the state of the high-pass filter unit is controlled according to the reverberation duration, so that the intensity of the de-reverberation is controlled. It is more suitable, which can not only ensure the de-reverberation effect, but also avoid damaging the audio frequency, and also avoid the influence of noise on the de-reverberation, and improve the user's use effect.

Description

Method, device, communication system and storage medium for reducing reverberation

technical field

The present disclosure relates to the field of communication technologies, and in particular, to a method, device, communication system and storage medium for reducing reverberation.

Background technique

After the sound waves are emitted from the sound source, they are reflected in the room by obstacles, mainly walls. These reflected sound waves are called echoes. When the sound source stops sounding, the sound wave will be reflected and absorbed many times in the room before disappearing. We feel that there are several sound waves mixed for a period of time after the sound source stops sounding. Generally, this kind of indoor sound source is stopped sounding. The sound continuation phenomenon that still exists is called reverberation, and this period of time is called the reverberation duration.

For scenarios for voice communication, the longer reverberation time will affect the clarity of the voice and reduce the recognition rate of the voice recognition system.

SUMMARY OF THE INVENTION

To overcome the problems in the related art, the present disclosure provides a method, device, communication system and storage medium for reducing reverberation.

According to a first aspect of the embodiments of the present disclosure, there is provided a method for reducing reverberation, which is applied to a communication system, where the communication system includes a first communication end and a second communication end, and the method includes:

Determine the first time domain information transmitted by the first communication end and the second time domain information transmitted by the second communication end, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information is the The audio corresponding to the reflected sound wave of the original sound wave;

determining the reverberation duration according to the first time domain information and the second time domain information;

According to the reverberation duration, the state of the high-pass filter unit of the communication system is controlled.

Optionally, the controlling the state of the high-pass filtering unit of the communication system according to the reverberation duration includes:

When the high-pass filtering unit is in a non-working state, if the reverberation duration is greater than or equal to a first set duration, the high-pass filtering unit is controlled to enter an working state.

Optionally, the controlling the state of the high-pass filtering unit of the communication system according to the reverberation duration includes:

When the high-pass filtering unit is in the working state, if the reverberation duration is less than the second set duration, the high-pass filtering unit is controlled to enter the non-working state.

Optionally, the determining the reverberation duration according to the first time domain information and the second time domain information includes:

processing the first time domain information and the second time domain information respectively, to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information ;

In the set frequency band, calculate the difference between the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point;

summing all of the differences to determine the sum;

The reverberation duration is determined according to the configuration information and the sum value, wherein the configuration information represents a mapping relationship between the sum value and the reverberation duration.

Optionally, the first time domain information and the second time domain information are processed separately, and the first frequency domain information corresponding to the first time domain information and the corresponding second time domain information are determined. The second frequency domain information of , including:

Perform Fourier transform, modulo processing and normalization processing on the first time domain information and the second time domain information in sequence to determine the first frequency domain information and the second frequency domain information .

Optionally, the set frequency band includes a frequency band less than or equal to 500 Hz.

Optionally, the method further includes:

When the high-pass filtering unit is in a non-working state, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit is controlled to enter the working state.

Optionally, the method further includes:

When the high-pass filtering unit is in the working state, if the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit is controlled to enter the non-working state.

According to a second aspect of the embodiments of the present disclosure, there is provided an apparatus for reducing reverberation, which is applied to a communication system, where the communication system includes a first communication end and a second communication end, and the apparatus includes:

A determination module, configured to determine the first time domain information transmitted by the first communication end and the second time domain information transmitted by the second communication end, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information The time domain information is the audio frequency corresponding to the reflected sound wave of the original sound wave;

is also used for determining the reverberation duration according to the first time domain information and the second time domain information;

A control module, configured to control the state of the high-pass filter unit of the communication system according to the reverberation duration.

Optionally, the control module is used for:

When the high-pass filtering unit is in a non-working state, if the reverberation duration is greater than or equal to a first set duration, the high-pass filtering unit is controlled to enter an working state.

Optionally, the control module is used for:

When the high-pass filtering unit is in the working state, if the reverberation duration is less than the second set duration, the high-pass filtering unit is controlled to enter the non-working state.

Optionally, the determining module is used for:

processing the first time domain information and the second time domain information respectively, to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information ;

In the set frequency band, calculate the difference between the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point;

summing all of the differences to determine the sum;

The reverberation duration is determined according to the configuration information and the sum value, wherein the configuration information represents a mapping relationship between the sum value and the reverberation duration.

Optionally, the determining module is used for:

Perform Fourier transform, modulo processing and normalization processing on the first time domain information and the second time domain information in sequence to determine the first frequency domain information and the second frequency domain information .

Optionally, the set frequency band includes a frequency band less than or equal to 500 Hz.

Optionally, the control module is also used for:

When the high-pass filtering unit is in a non-working state, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit is controlled to enter the working state.

Optionally, the control module is also used for:

When the high-pass filtering unit is in the working state, if the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit is controlled to enter the non-working state.

According to a third aspect of the embodiments of the present disclosure, there is provided a communication system, the communication system comprising:

processor;

a memory for storing the processor-executable instructions;

Wherein, the processor is configured to perform the method of the first aspect.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium, which, when instructions in the storage medium are executed by a processor of a communication system, enables the communication system to execute the first aspect the method described.

The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: in this method, according to the audio frequency corresponding to the original sound wave and the audio frequency corresponding to the reflected sound wave of the original sound wave, the reverberation time length of the original wave and the reflected sound wave is determined, and then according to the mixed audio frequency The sound duration controls the state of the high-pass filter unit, so that the intensity of the de-reverberation is more suitable, which can not only ensure the de-reverberation effect, but also avoid damaging the audio, and also avoid the influence of noise on the de-reverberation, and improve the user's use effect. .

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a flowchart of a method for reducing reverberation according to an exemplary embodiment.

FIG. 2 is a flowchart of a method for reducing reverberation according to an exemplary embodiment.

Fig. 3 is a block diagram of an apparatus for reducing reverberation according to an exemplary embodiment.

FIG. 4 is a schematic diagram of a communication system according to an exemplary embodiment.

FIG. 5 is a block diagram of a communication system according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

In the related art, in a voice communication scenario, especially represented by a conference communication system, de-reverberation is mainly implemented by a de-reverberation algorithm. However, it is difficult for the de-reverberation algorithm in the related art to accurately separate the desired direct sound and the early reflection sound (which is beneficial to listening) from the late reflection sound. If the intensity of the de-reverberation is too high, it will damage the speech. The intensity of the reverberation is too low, and the de-reverberation effect is not good. In addition, the de-reverberation algorithm may also be affected by noise, etc., and the effect is poor.

The present disclosure provides a method for reducing reverberation, which is applied to a communication system. In this method, according to the audio frequency corresponding to the original sound wave and the audio frequency corresponding to the reflected sound wave of the original sound wave, the reverberation duration of the original wave and the reflected sound wave is determined, and then the state of the high-pass filter unit is controlled according to the reverberation duration, so that the intensity of the de-reverberation is controlled. It is more suitable, which can not only ensure the de-reverberation effect, but also avoid damaging the audio, and also avoid the influence of noise on the de-reverberation, and improve the user's use effect.

In one exemplary embodiment, a method of reducing reverberation is provided, applied to a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . It should be noted that, the first communication terminal 1 and the second communication terminal 2 may be the same or different, which is not limited. In addition, in this method, the voice transmission of the first communication terminal 1 to the second communication terminal 2 is mainly used as an example for introduction. For the method of transmitting the voice of the second communication terminal 2 to the first communication terminal 1, reference may be made to the method of transmitting the voice of the first communication terminal 1 to the second communication terminal 2, which will not be repeated here.

Referring to Figure 1, the method includes:

S110: Acquire the first time domain information transmitted by the first communication terminal and the second time domain information of the second communication terminal, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information is the reflected sound wave of the original sound wave corresponding audio;

S120. Determine the reverberation duration according to the first time domain information and the second time domain information;

S130. Control the state of the high-pass filter unit according to the reverberation duration.

In step S110 , the communication system may include the information processing unit 3 . The first communication terminal 1 may include a first audio input terminal 11 and a first audio output terminal 12 . The second communication terminal 2 may include a second audio input terminal 21 and a second audio output terminal 22 . The audio input by the first audio input terminal 11 can be output by the second audio output terminal 22 after passing through the information processing unit 3 , and the audio input by the second audio input terminal 21 can be output by the first audio output after passing through the information processing unit 3 The terminal 12 outputs, thereby realizing the voice communication between the user of the first communication terminal 1 and the user of the second communication terminal 2 . The first audio input end 11 and the second audio input end 21 may include devices such as microphones for collecting audio, and the first audio output end 12 and the second audio output end 22 may include devices such as speakers for playing audio.

Wherein, after the audio corresponding to the native wave is input to the first audio input terminal 11, the first audio input terminal 11 can receive the first time domain information, and then transmit the first time domain information to the information processing unit 3, and the information processing unit 3, the first time domain information transmitted by the first communication terminal 1 can be received.

The information processing unit 3 transmits the first time domain information to the second audio output terminal 22, and the second audio output terminal 22 can output the audio corresponding to the first time domain information.

After the second audio output terminal 22 outputs the audio, the audio corresponding to the reflected sound wave can be generated in the environment where the second communication terminal 2 is located, and the second audio input terminal 21 can receive the audio corresponding to the reflected sound wave (ie, the second time domain). information), and then transmit it to the information processing unit 3, and the information processing unit 3 can receive the second time domain information.

It should be noted that the second time domain information includes the audio frequency corresponding to the sound wave output by the second audio output terminal 22 and the audio frequency corresponding to the reflected sound wave generated by the sound wave in the environment where the second communication terminal 2 is located, that is, the first The sound waves output by the second audio output terminal 22 and the reflected sound waves generated by the sound waves in the environment where the second communication terminal 2 is located are referred to as the reflected sound waves of the original waves input by the first audio input terminal 11 .

Wherein, during the continuous communication between the first communication terminal 1 and the second communication terminal 2, the audio received by the information processing unit 3 includes the first time domain information and the second time domain information. The information processing unit 3 can extract the first time domain information and the second time domain information from the received audio based on VAD (Voice Activity Detection (VAD), also known as voice endpoint detection or voice boundary detection) technology. Therefore, the information processing unit 3 can determine the first time domain information transmitted by the first communication terminal 1 and the second time domain information transmitted by the second communication terminal 2 .

It should be noted that in the process of communication between the first communication terminal 1 and the second communication terminal 2, the audio corresponding to the native wave can also be input to the second audio input terminal 21. The native waves input by the audio input terminal 11 are not the same. The audio corresponding to the native wave transmitted by the second audio input terminal 21 to the information processing unit 3 may be recorded as the third time domain information. At the same time, the information processing unit 3 can transmit the third time domain information to the first audio output terminal 12, and the first audio output terminal 12 can belong to the audio corresponding to the third time domain information. The audio output by the first audio output terminal 12 can generate the audio corresponding to the reflected sound wave in the environment where the first communication terminal 1 is located, and the audio corresponding to the reflected sound wave can be received by the first audio input terminal 11 (which can be recorded as the fourth time domain). information), and then transmit it to the information processing unit 3, and the information processing unit 3 can receive the fourth time domain information.

That is to say, in general, the audio received by the information processing unit 3 includes the first time domain information, the second time domain information, the third time domain information and the fourth time domain information. Wherein, the information processing unit 3 can extract the first time domain information, the second time domain information, the third time domain information and the fourth time domain information from the received audio based on the VAD technology, thus, the information processing unit 3 The first time domain information transmitted by the first communication terminal 1 and the second time domain information transmitted by the second communication terminal 2 can be determined.

In addition, taking the first communication terminal 1 as an example, the user can make the first audio input terminal 11 receive the audio corresponding to the native wave by sending out a voice at the first audio input terminal 11, so as to realize the input of the first audio input terminal 11. A time domain information. Wherein, the user can make a voice by speaking, and can also make a voice through other voice devices, which is not limited.

In step S120, after the first time domain information and the second time domain information corresponding to each other are determined, the reverberation duration can be determined based on the above-mentioned first time domain information and the second time domain information, so as to facilitate the follow-up according to the reverberation time duration to determine whether filtering is required.

It should be noted that the audio corresponding to the original wave is recorded as the first time domain information, and the audio corresponding to the reflected sound wave of the above-mentioned original wave is recorded as the second time domain information, so it can be considered that the first time domain information and the second time domain information are mutually exclusive. correspond.

In step S130, the state of the high-pass filtering unit may be controlled based on the reverberation duration. Under normal circumstances, when the reverberation time reaches a certain time, the reverberation will be more serious, and the user can feel the influence of the reverberation. Therefore, in this step, the state of the high-pass filter unit can be controlled based on the magnitude relationship between the reverberation duration and the set duration (eg, the above-mentioned certain duration).

Wherein, the state of the high-pass filtering unit may include a working state and a non-working state. When the high-pass filtering unit is in a non-working state, the high-pass filtering unit does not process the audio passing through it, and the audio can pass through the high-pass filtering unit as it is. When the high-pass filter unit is in the working state, the high-pass filter unit performs filtering processing on the audio passing through it, so as to filter out the low-frequency part of the audio frequency, so as to reduce the low-frequency reverberation.

In case 1, the high-pass filter unit is in a non-working state.

In case 1, if the reverberation duration is less than the first set duration, it means that the reverberation duration is small and the impact of the reverberation on the user is small. There is no need to perform the process of eliminating the reverberation, and the high-pass filter unit can be controlled to keep at non-working state. Among them, when the reverberation time is zero, it can be considered that there is no reverberation.

In case 1, if the reverberation duration is greater than or equal to the first set duration, it means that the reverberation duration is too large and the reverberation is serious, and the high-pass filter unit can be controlled to enter the working state.

When the high-pass filter unit is in the working state, the audio (for example, the first time domain information) sent by the information processing unit 3 needs to be filtered by the high-pass filter unit before being transmitted to the second audio output terminal 22 of the second communication terminal 2, It is then output by the second audio output terminal 22 . Since the audio output from the second audio output end 22 has been filtered by the high-pass filter unit, it can well avoid reverberation at the second communication end 2, or in other words, even if reverberation occurs at the second communication end 2, its reverberation The duration is also relatively small and cannot have a substantial impact on the user, which can well ensure the user's experience.

In addition, in case 1, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit may be controlled to enter the working state. If the second control information for controlling the high-pass filtering unit to enter the non-operating state is received, no action is taken, so that the high-pass filtering unit continues to remain in the non-operating state.

For example, when the high-pass filtering unit is in a non-working state, the user can input the first control information to the information processing unit 3, and the information processing unit 3 can control the high-pass filtering unit to enter the working state after receiving the first control information.

In case 2, the high-pass filter unit is in a non-working state.

In case 1, if the reverberation duration is greater than or equal to the second set duration, it means that even if the high-pass filter unit is in the working state, the reverberation duration is still large and the reverberation is still serious, then the high-pass filter unit can be controlled to keep working state. Moreover, based on the judgment result that the reverberation duration is greater than or equal to the second set duration, the user can be reminded to check the entire communication system to determine the cause of the reverberation, so as to take corresponding measures to eliminate or reduce the influence of the reverberation.

In case 2, if the reverberation duration is less than the second set duration, it means that the reverberation duration is very small, and the impact of the reverberation on the user is very small, and the process of eliminating the reverberation is no longer necessary, and the high-pass filter unit can be controlled to continue to enter Inactive state to reduce the power consumption of the communication system.

In this step, when the reverberation time is very small, the high-pass filter unit is in a non-working state, which can well ensure that the second communication terminal 2 receives the complete first time domain information, thereby improving the quality of the audio output by the second communication terminal 2. effect, improve the user experience.

In addition, in case 2, if the first control information for controlling the high-pass filter unit to enter the working state is received, no action is taken, so that the high-pass filter unit continues to remain in the working state. If the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit may be controlled to enter the non-working state.

For example, the user can input the second control information to the information processing unit 3, and after the information processing unit 3 receives the second control information, it can control the high-pass filtering unit to enter the working state.

It should be noted that the reverberation duration determined when the high-pass filter unit is in the working state is generally greater than the reverberation duration determined when the high-pass filter unit is in the non-working state. Therefore, in this method, the second set duration can be set to be smaller than the first set duration. A set duration to avoid frequent switching of the high-pass filter unit between the working state and the non-working state. For example, the first set duration may be set to 1.1s, and the second set duration may be set to 0.9s.

In this method, according to the audio frequency corresponding to the original sound wave and the audio frequency corresponding to the reflected sound wave of the original sound wave, the reverberation duration of the original wave and the reflected sound wave is determined, and then the state of the high-pass filter unit is controlled according to the reverberation duration, so that the intensity of the de-reverberation is controlled. It is more suitable, which can not only ensure the de-reverberation effect, but also avoid damaging the audio, and also avoid the influence of noise on the de-reverberation, and improve the user's use effect.

It should be noted that the high-pass filtering unit may include a first high-pass filtering unit 4 and a second high-pass filtering unit 5 . The first high-pass filter unit 4 is used to reduce or even eliminate the reverberation of the first communication terminal 1, and can be located between the information processing unit 3 and the first audio output terminal 12, or between the information processing unit 3 and the second audio input terminal 12. between end 21. The second high-pass filter unit 5 is used to reduce or even eliminate the reverberation of the second communication terminal 2, and may be located between the information processing unit 3 and the second audio output terminal 22, or may be located between the information processing unit 3 and the first audio input terminal 11 between.

Example 1,

The communication system is a voice communication system, which includes an information processing unit 3, a control unit 6, a first audio input end 11, a first audio output end 12, a second audio input end 21, a second audio output end 22, a first high-pass filter unit 4 and second high-pass filtering unit 5 . The first high-pass filtering unit 4 is located between the information processing unit 3 and the first audio output terminal 12, and the second high-pass filtering unit 5 is located between the information processing unit 3 and the second audio output unit. The first audio input terminal 11 and the first audio output terminal 12 constitute the first communication terminal 1 , and the second audio output terminal 22 and the second audio output terminal 22 constitute the second communication terminal 2 . The first user is located at the first communication terminal 1, and the second user is located at the second communication terminal 2.

When the first user speaks at the first communication terminal 1, the first audio input terminal 11 can collect the voice made by the first user, and the voice is the audio corresponding to the first original sound wave, which is recorded as the first time domain information. The first audio input terminal 11 can transmit the first time domain information to the information processing unit 3, and then the information processing unit 3 transmits it to the second high-pass filtering unit 5, and then the second high-pass filtering unit 5 transmits the first time domain information. To the second audio output terminal 22, the second audio output terminal 22 plays audio.

The audio transmission process from the first audio output terminal 11 to the second audio output terminal 22 may be shown with reference to the dashed arrows in FIG. 4 .

After the second audio output terminal 22 plays the audio, the audio corresponding to the first reflected sound wave of the first native wave can be generated in the environment where the second communication terminal 2 is located, and the second audio input terminal 21 can collect the above-mentioned first reflection The audio corresponding to the sound wave is recorded as the second time domain information. The second audio input terminal 21 can transmit the second time domain information to the information processing unit 3 .

When the second user speaks on the second communication terminal 2, the second audio input terminal 21 can collect the voice sent by the second user, and the voice is the audio corresponding to the second original sound wave, which is recorded as the third time domain information. The second audio input terminal 21 can transmit the third time domain information to the information processing unit 3, and then the information processing unit 3 transmits the third time domain information to the first high-pass filtering unit 4, and then the first high-pass filtering unit 4 transmits the third time domain information To the first audio output terminal 12, the first audio output terminal 12 plays audio.

The audio transmission process from the second audio output terminal 21 to the first audio output terminal 12 may be shown with reference to the dotted arrow in FIG. 4 .

After the first audio output terminal 13 plays the audio, the audio corresponding to the second reflected sound wave of the second original wave can be generated in the environment where the first communication terminal 1 is located, and the first audio input terminal 11 can collect the above-mentioned second reflection The audio corresponding to the sound wave is recorded as the fourth time domain information. The first audio input terminal 11 can transmit the fourth time domain information to the information processing unit 3 .

During the communication between the first user and the second user through the communication system, the information processing unit 3 can extract the first time domain information, the second time domain information, the third time domain information and the received audio frequency based on the VAD technology. Fourth time domain information. The first reverberation duration may be determined based on the first time domain information and the second time domain information, and the second reverberation duration may be determined based on the third time domain information and the fourth time domain information.

When the first high-pass filter unit 4 is in a non-working state, if the second reverberation duration is less than the first set duration (for example, 1.1s), it means that the audio heard by the first user is less affected by the reverberation, or the audio is not received If the reverberation is affected, the information processing unit 3 does not work, and the first high-pass filter unit 4 continues to remain in a non-working state; if the second reverberation duration is greater than or equal to the first set duration, it means that the audio heard by the first user is mixed If the influence of the noise is large, the information processing unit 3 can send the first feedback information to the control unit 6, and the control unit 6 can control the first high-pass filter unit 4 to enter the working state based on the first feedback information.

When the first high-pass filter unit 4 is in the working state, if the second reverberation duration is less than the second set duration (for example, 0.9s), it means that the audio heard by the first user is less affected by the reverberation, or the reverberation is not received. The information processing unit 3 can send the second feedback information to the control unit 6, and the control unit 6 can control the first high-pass filter unit 4 to enter the non-working state based on the second feedback information; if the second reverberation duration is longer than or Equal to the second set duration, indicating that the audio heard by the first user is greatly affected by the reverberation, and the information processing unit 3 can be inactive, so that the first high-pass filtering unit 4 continues to be in a working state.

When the second high-pass filter unit 5 is in a non-working state, if the first reverberation duration is less than the first set duration (for example, 1.1s), it means that the audio heard by the second user is less affected by the reverberation, or has not been received. If the reverberation is affected, the information processing unit 3 does not act, and the second high-pass filter unit 5 continues to remain in a non-working state; if the first reverberation duration is greater than or equal to the first set duration, it means that the audio heard by the second user is mixed If the influence is relatively large, the information processing unit 3 can send the third feedback information to the control unit 6, and the control unit 6 can control the second high-pass filter unit 5 to enter the working state based on the third feedback information.

When the second high-pass filter unit 5 is in the working state, if the first reverberation duration is less than the second set duration (for example, 0.9s), it means that the audio heard by the second user is less affected by the reverberation, or the reverberation is not received. The information processing unit 3 can send the fourth feedback information to the control unit 6, and the control unit 6 can control the second high-pass filter unit 5 to enter the non-working state based on the fourth feedback information; if the first reverberation duration is longer than or Equal to the second set duration, indicating that the audio heard by the second user is greatly affected by the reverberation, and the information processing unit 3 can be inactive, so that the second high-pass filtering unit 5 continues to be in a working state.

The information processing unit 3 controls the information transmission process of the first high-pass filtering unit and the second high-pass filtering unit through the control unit 4 as shown by the implementation arrows in FIG. 4 .

In this example 1, according to the audio corresponding to the original sound wave and the audio corresponding to the reflected sound wave of the original sound wave, the reverberation duration of the original wave and the reflected sound wave is determined, and then the state of the high-pass filter unit is controlled according to the reverberation duration, so that the de-reverberation The intensity is more appropriate, which can not only ensure the effect of de-reverberation, but also avoid damaging the audio frequency, and also avoid the influence of noise on the de-reverberation, so as to better ensure the communication effect between the first user and the second user.

In addition, in this example 1, the information processing unit 3 can control the states of the first high-pass filtering unit 4 and the second high-pass filtering unit 5 respectively through the control unit 6, and the degree of refinement of reducing the reverberation is high.

It should be noted that the information processing unit 3 can control the first high-pass filtering unit 4 and the second high-pass filtering unit 5 to be in the same state through the control unit 6 .

Example 2,

This example 2 has the same structure as the communication system of example 1. The difference between Example 2 and Example 1 is that in Example 2, the states of the first high-pass filtering unit 4 and the second high-pass filtering unit 5 are the same. That is, both the first high-pass filtering unit 4 and the second high-pass filtering unit 5 are in an operating state, or both are in a non-operating state.

In this example 2, when both the first high-pass filtering unit 4 and the second high-pass filtering unit 5 are in a non-working state, if the second reverberation duration is less than the first set duration (for example, 1.1s), and the first reverberation duration is is greater than or equal to the first set duration, the information processing unit 3 can be inactive, and the first high-pass filter unit 4 and the second high-pass filter unit 5 continue to remain in the non-working state; if the first reverberation duration and the second reverberation duration are at least One, greater than or equal to the first set duration, the information processing unit 3 can send the fifth feedback information to the control unit 6, and the control unit 6 can control the first high-pass filtering unit 4 and the second high-pass filtering unit 4 and the second high-pass filter based on the fifth feedback information. The filtering units 5 all enter the working state.

When both the first high-pass unit and the second high-pass filtering unit 5 are in working state, if at least one of the first reverberation duration and the second reverberation duration is less than the second set duration (for example, 0.9s), the information processing unit 3 The second feedback information can be sent to the control unit 6, and the control unit 6 can control both the first high-pass filtering unit 4 and the second high-pass filtering unit 5 to enter the non-working state based on the sixth feedback information; if the second reverberation duration is longer than or equal to the second set duration, and the first reverberation duration is greater than or equal to the second set duration, the information processing unit 3 can be inactive, so that both the first high-pass filtering unit 4 and the second high-pass filtering unit 5 continue to remain at working status.

In this example 2, according to the audio corresponding to the original sound wave and the audio corresponding to the reflected sound wave of the original sound wave, the reverberation duration of the original wave and the reflected sound wave is determined, and then the state of the high-pass filter unit is controlled according to the reverberation duration, so that the de-reverberation The intensity is more appropriate, which can not only ensure the effect of de-reverberation, but also avoid damaging the audio frequency, and also avoid the influence of noise on the de-reverberation, so as to better ensure the communication effect between the first user and the second user.

In addition, in this example 2, the information processing unit 3 performs synchronous control on the first high-pass filtering unit 4 and the second high-pass filtering unit 5 through the control unit 6, and the control process is simpler.

In one exemplary embodiment, a method of reducing reverberation is provided, applied to a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . It should be noted that, the first communication terminal 1 and the second communication terminal 2 may be the same or different, which is not limited. In addition, in this method, the voice transmission of the first communication terminal 1 to the second communication terminal 2 is mainly used as an example for introduction. For the method of transmitting the voice of the second communication terminal 2 to the first communication terminal 1, reference may be made to the method of transmitting the voice of the first communication terminal 1 to the second communication terminal 2, which will not be repeated here.

Referring to FIG. 2 , in the method, determining the reverberation duration according to the first time domain information and the second time domain information may include:

S210. Process the first time domain information and the second time domain information respectively, and determine the first frequency domain information corresponding to the first time domain information and the second frequency domain information corresponding to the second time domain information;

S220, in the set frequency band, calculate the difference between the amplitude values corresponding to each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point;

S230, sum all the difference values, and determine the sum value;

S240. Determine the reverberation duration according to the configuration information and the sum value, where the configuration information represents the mapping relationship between the sum value and the reverberation duration.

In step S210, Fourier transform, modulo processing, normalization processing, etc. may be sequentially performed on the first time-domain information to obtain the first frequency-domain information. The first frequency domain information includes multiple frequency points and an amplitude value corresponding to each frequency point.

Fourier transform, modulo processing, normalization processing, etc. may be sequentially performed on the second time domain information to obtain the second frequency domain information. The second frequency domain information also includes a plurality of frequency points and an amplitude value corresponding to each frequency point.

In step S220, the set frequency band may be set before the communication system leaves the factory, or it may be set after the communication system leaves the factory. In addition, after the setting of the set frequency band is completed, it can be modified later to better satisfy the user different needs.

Among them, the set frequency band is set according to actual needs, which is not limited. For example, the set frequency band may include a low frequency frequency band, and the low frequency frequency band is, for example, a frequency band less than or equal to 500 Hz. That is, the set frequency band may be a frequency band greater than or equal to 0 Hz and less than or equal to 500 Hz. In addition, the set frequency band may be all frequency bands.

It should be noted that the number of intermediate frequency points in the set frequency band is related to the sampling rate of the first time domain information and the sampling time interval. In general, the more the number of intermediate frequency points in the set frequency band, the higher the reliability of this method.

In this step, the amplitude value corresponding to each frequency point in the set frequency band in the first frequency domain information may be determined first. And determine the amplitude value corresponding to each frequency point in the set frequency band in the second frequency domain information. Among them, the amplitude corresponding to the information in the first frequency domain of the frequency point can be recorded as the first amplitude value of this frequency point, and the amplitude value corresponding to the information of this frequency point in the second frequency domain can be recorded as the second amplitude value of this frequency point , the difference between the first amplitude and the second amplitude can be recorded as the difference corresponding to this frequency point. Based on the above method, the difference value corresponding to each frequency point in the set frequency band can be determined.

In step S230, all the differences may be summed to obtain the sum of all the differences. This sum can be used to reflect the reverb duration. In general, the larger the sum value, the longer the reverberation time.

In step S240, the configuration information may be set before the communication system leaves the factory, or it may be set after the communication system leaves the factory. In addition, after the configuration information is set, it can be modified later to better meet the different needs of users. need. The specific content of the configuration information can be determined through experiments.

The mapping relationship between the configuration information signature and the value and the reverberation duration may be a relationship curve or a relationship formula, or may be other forms of information, which is not limited. Among them, the sum value is positively correlated with the reverberation duration, that is, the larger the sum value is, the longer the reverberation duration is.

For example, the configuration information is a curve of representation sum value versus reverberation duration. After the sum value is determined, the reverberation duration corresponding to the sum value can be found from the relationship curve.

For another example, the configuration information is a relationship between the representation sum value and the reverberation duration. After the sum value is determined, the sum value can be substituted into the relational expression to calculate the reverberation duration corresponding to the sum value.

In this method, the configuration information of the representation sum value and the reverberation duration can be preset in the communication system, and then based on the configuration information, the first frequency domain information corresponding to the first time domain information and the second frequency domain information corresponding to the second time domain information Domain information, estimate the reverberation duration, provide reliable data for the subsequent control of the high-pass filter unit based on the reverberation duration, improve the reliability of the method, and further improve the user experience.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . It should be noted that, the first communication terminal 1 and the second communication terminal 2 may be the same or different, which is not limited.

The apparatus is used to implement the above-mentioned method. For example, as shown in FIG. 3 , the apparatus may include a determination module 101 and a control module 102. In the process of implementing the above-mentioned method, the apparatus may:

The determining module 101 is used to determine the first time domain information transmitted by the first communication terminal 1 and the second time domain information transmitted by the second communication terminal 2, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information is the audio corresponding to the original sound wave. The domain information is the audio corresponding to the reflected sound wave of the original sound wave;

is also used to determine the reverberation duration according to the first time domain information and the second time domain information;

The control module 102 is configured to control the state of the high-pass filter unit according to the reverberation duration.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, the control module 102 is used for:

When the high-pass filtering unit is in a non-working state, if the reverberation duration is greater than or equal to the first set duration, the high-pass filtering unit is controlled to enter the working state.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, the control module 102 is used for:

When the high-pass filtering unit is in the working state, if the reverberation duration is less than the second set duration, the high-pass filtering unit is controlled to enter the non-working state.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, the determining module 101 is used for:

processing the first time domain information and the second time domain information respectively, and determining the first frequency domain information corresponding to the first time domain information and the second frequency domain information corresponding to the second time domain information;

In the set frequency band, calculate the difference between the amplitude values corresponding to each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point;

Sum all the differences to determine the sum;

The reverberation duration is determined according to the configuration information and the sum value, wherein the configuration information represents the mapping relationship between the sum value and the reverberation duration.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, a determination module is used for:

Fourier transform, modulo processing, and normalization processing are sequentially performed on the first time domain information and the second time domain information, respectively, to determine the first frequency domain information and the second frequency domain information.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . In the device, the set frequency band includes a frequency band less than or equal to 500 Hz.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, the control module 102 is also used for:

When the high-pass filtering unit is in the non-working state, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit is controlled to enter the working state.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . Referring to Fig. 3, in the device, the control module 102 is also used for:

When the high-pass filtering unit is in the working state, if the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit is controlled to enter the non-working state.

In one exemplary embodiment, a communication system is provided. The communication system may be a voice communication system, that is, the communication system may be a system for implementing voice communication. Referring to FIG. 4 , the communication system may include a first communication end 1 and a second communication end 2 . It should be noted that, the first communication terminal 1 and the second communication terminal 2 may be the same or different, which is not limited.

5, the communication system 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input/output (I/O) interface 412, sensors component 414 , and communication component 416 .

The processing component 402 generally controls the overall operation of the communication system 400, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to perform all or some of the steps of the methods described above. Additionally, processing component 402 may include one or more modules that facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

Memory 404 is configured to store various types of data to support operation of communication system 400 . Examples of such data include instructions for any application or method operating on the communication system 400, contact data, phonebook data, messages, pictures, videos, and the like. The memory 404 may be implemented by any type of volatile or non-volatile memory communication system or combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

Power supply component 406 provides power to various components of communication system 400 . Power supply components 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to communication system 400 .

Multimedia component 408 includes screens that provide an output interface between communication system 400 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swipe, and gestures on the touch panel. A touch sensor can sense not only the boundaries of a touch or swipe action, but also the duration and pressure associated with the touch or swipe action. In some embodiments, the multimedia component 408 includes a front camera application and/or a rear camera application. When the communication system 400 is in an operation mode, such as a shooting mode or a video mode, the front camera application and/or the rear camera application may receive external multimedia data. Each front camera application and rear camera application can be a fixed optical lens system or have focal length and optical zoom capability.

Audio component 410 is configured to output and/or input audio signals. For example, audio component 410 includes a microphone (MIC) that is configured to receive external audio signals when communication system 400 is in operating modes, such as call mode, recording mode, and voice recognition mode. The received audio signal may be further stored in memory 404 or transmitted via communication component 416 . In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

The I/O interface 412 provides an interface between the processing component 402 and a peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to: home button, volume buttons, start button, and lock button.

Sensor assembly 414 includes one or more sensors for providing status assessments of various aspects of communication system 400 . For example, the sensor assembly 414 can detect the open/closed state of the communication system 400, the relative positioning of the components, such as the display and keypad of the communication system 400, and the sensor assembly 414 can also detect the communication system 400 or a component of the communication system 400. Changes in location, presence or absence of user contact with the communication system 400 , orientation or acceleration/deceleration of the communication system 400 and changes in the temperature of the communication system 400 . Sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 416 is configured to facilitate wired or wireless communication between communication system 400 and other communication systems. Communication system 700 may access wireless networks based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In one exemplary embodiment, the communication component 416 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 416 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, communication system 400 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing communication systems (DSPDs), programmable logic devices (PLDs), field A programmable gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the above-described method.

In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions, such as memory 404 including instructions, executable by processor 420 of communication system 400 to perform the above-described method is also provided. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage communication system, and the like. When the instructions in the storage medium are executed by the processor of the communication system, the communication system is enabled to perform the methods shown in the above embodiments.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common general knowledge or techniques in the technical field not disclosed by this disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the claims.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common general knowledge or techniques in the technical field not disclosed by this disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (18)

1. A method for reducing reverberation, applied to a communication system, the communication system comprising a first communication terminal and a second communication terminal, wherein the method comprises: Determine the first time domain information transmitted by the first communication end and the second time domain information transmitted by the second communication end, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information is the The audio corresponding to the reflected sound wave of the original sound wave; determining the reverberation duration according to the first time domain information and the second time domain information; According to the reverberation duration, the state of the high-pass filter unit of the communication system is controlled. 2. The method according to claim 1, wherein the controlling the state of the high-pass filter unit of the communication system according to the reverberation time length comprises: When the high-pass filtering unit is in a non-working state, if the reverberation duration is greater than or equal to a first set duration, the high-pass filtering unit is controlled to enter an working state. 3. The method according to claim 1, wherein the controlling the state of the high-pass filter unit of the communication system according to the reverberation duration comprises: When the high-pass filtering unit is in the working state, if the reverberation duration is less than the second set duration, the high-pass filtering unit is controlled to enter the non-working state. 4. The method according to any one of claims 1-3, wherein the determining the reverberation duration according to the first time domain information and the second time domain information comprises: processing the first time domain information and the second time domain information respectively, to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information ; In the set frequency band, calculate the difference between the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point; summing all of the differences to determine the sum; The reverberation duration is determined according to the configuration information and the sum value, wherein the configuration information represents a mapping relationship between the sum value and the reverberation duration. 5 . The method according to claim 4 , wherein the first time domain information and the second time domain information are respectively processed to determine the first frequency corresponding to the first time domain information. 6 . domain information and the second frequency domain information corresponding to the second time domain information, including: Perform Fourier transform, modulo processing and normalization processing on the first time domain information and the second time domain information in sequence to determine the first frequency domain information and the second frequency domain information . 6 . The method according to claim 4 , wherein the set frequency band includes a frequency band less than or equal to 500 Hz. 7 . 7. The method according to any one of claims 1-3, wherein the method further comprises: When the high-pass filtering unit is in a non-working state, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit is controlled to enter the working state. 8. The method according to any one of claims 1-3, wherein the method further comprises: When the high-pass filtering unit is in the working state, if the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit is controlled to enter the non-working state. 9. A device for reducing reverberation, applied to a communication system, the communication system comprising a first communication end and a second communication end, wherein the device comprises: A determination module, configured to determine the first time domain information transmitted by the first communication end and the second time domain information transmitted by the second communication end, wherein the first time domain information is the audio corresponding to the original sound wave, and the second time domain information The time domain information is the audio frequency corresponding to the reflected sound wave of the original sound wave; is also used for determining the reverberation duration according to the first time domain information and the second time domain information; A control module, configured to control the state of the high-pass filter unit of the communication system according to the reverberation duration. 10. The device according to claim 9, wherein the control module is used for: When the high-pass filtering unit is in a non-working state, if the reverberation duration is greater than or equal to a first set duration, the high-pass filtering unit is controlled to enter an working state. 11. The device according to claim 9, wherein the control module is used for: When the high-pass filtering unit is in the working state, if the reverberation duration is less than the second set duration, the high-pass filtering unit is controlled to enter the non-working state. 12. The device according to any one of claims 9-11, wherein the determining module is configured to: processing the first time domain information and the second time domain information respectively, to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information ; In the set frequency band, calculate the difference between the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determine the difference value corresponding to each frequency point; summing all of the differences to determine the sum; The reverberation duration is determined according to the configuration information and the sum value, wherein the configuration information represents a mapping relationship between the sum value and the reverberation duration. 13. The apparatus according to claim 12, wherein the determining module is configured to: Perform Fourier transform, modulo processing and normalization processing on the first time domain information and the second time domain information in sequence to determine the first frequency domain information and the second frequency domain information . 14. The apparatus according to claim 12, wherein the set frequency band includes a frequency band less than or equal to 500 Hz. 15. The device according to any one of claims 9-11, wherein the control module is further configured to: When the high-pass filtering unit is in a non-working state, if the first control information for controlling the high-pass filtering unit to enter the working state is received, the high-pass filtering unit is controlled to enter the working state. 16. The device according to any one of claims 9-11, wherein the control module is further configured to: When the high-pass filtering unit is in the working state, if the second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit is controlled to enter the non-working state. 17. A communication system, characterized in that the communication system comprises: processor; memory for storing instructions executable by the processor; wherein the processor is configured to perform the method of any of claims 1-8. 18. A non-transitory computer-readable storage medium, characterized in that, when the instructions in the storage medium are executed by a processor of a communication system, the communication system is enabled to perform any one of claims 1-8 the method described.

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